Die Casting Service - Ningbo Hexin specializes in low pressure casting, gravity casting, die casting mold manufacturing, aluminum casting factory

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With 15 years of manufacturing experience, HEXIN offers precision die casting with comprehensive quality checks at all stages: before production, during production, first article inspection and before delivery.

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HEXIN's network of die cast manufacturers in China ensures efficient and rapid production. Our capabilities include state-of-the-art automation facilities to support complex customized projects.

Die Casting Specialist

As experts in customized die casting solutions, we can increase product durability and reduce costs. Our advanced technology and machinery ensures that every part is high quality, functional and aesthetically pleasing.

What is Die Casting

Die casting is a highly efficient process for making fine, high-volume metal parts. The process uses specialized molds, known as die casting dies, which are used to produce multiple parts simultaneously, ensuring efficiency and consistency. Typically used for metals such as aluminum and zinc, die casting involves melting the metal and injecting it into these dies under high pressure.

Subsequent rapid cooling and solidification captures the intricate design and detail of the part, reducing the need for extensive secondary operations. However, some projects may require additional post-processing to meet tighter tolerances.

At Hersin, our team of experts scrutinizes each die casting project to ensure that our approach meets your specific requirements. We prioritize the optimization of our production process to ensure that each component meets high standards of durability and aesthetics. By focusing on advanced casting techniques and utilizing precision die casting machines, we can help you achieve excellence in both function and appearance, ultimately increasing the overall value of your product.

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Application areas of die castingDie casting is a high-precision, high-efficiency metal casting process that is widely used in a number of industries because of its ability to produce components with precise dimensions and consistent quality. The following are the main application areas of the die casting process:

Automotive: The die-casting process is widely used to manufacture engine blocks, gearbox housings, pistons and other components, ensuring high strength and tight dimensional tolerances to meet the high standards of the automotive industry.

Consumer Electronics: Used in the shells and complex internal parts of smart phones, laptops, cameras and other devices to ensure exquisite appearance and high performance.

Lighting: Die casting is widely used in the production of lamps and their components to ensure precise shapes and high-quality surface finishes to enhance product stability and consistency.

Medical: Die casting technology is used to manufacture high-precision medical device parts, such as surgical instruments and diagnostic instrument housings, to meet high requirements for reliability and sterility.

Industry: In industrial machinery, die casting is used to produce high-strength, high-pressure-resistant parts, such as support frames and housings, suitable for harsh working environments.

Advantages of Die CastingThe die casting process offers several unique advantages when manufacturing metal parts, making it the technology of choice for a wide range of applications in many industries:

High precision and consistency: die casting can precisely control the size and shape of the parts, to ensure that the parts tolerance is strict and consistent, especially suitable for mass production of high-quality complex parts.

Production speed: because the molten metal can quickly fill the mold and quickly cooled, die casting greatly shorten the production cycle, can produce a large number of parts in a short period of time, improve production efficiency.

Excellent strength and lightweight: through high-pressure casting, the metal structure is dense and fine-grained, so that the die-casting parts not only have high strength, but also maintain the lightweight characteristics, suitable for the requirements of high-strength and low weight parts.

High material utilization: The die casting process is very efficient in its use of materials, minimizing scrap and also reducing the need for subsequent processing, reducing material waste and costs.

Disadvantages of die castingAlthough the die casting process has obvious advantages in many areas, there are some limitations, as follows:

High mold cost: die-casting requires the use of precision metal molds, the manufacturing cost of these molds is high, especially for mass production, the initial investment is large.

Limited applicability to small quantities of complex parts: Due to the high cost of molds, the die casting process is more suited to mass production and is less cost-effective for small quantities and single-piece production.

Limited choice of materials: die casting is mainly suitable for low melting point metals such as aluminum, zinc, magnesium, etc. For high melting point metals, such as steel or copper, the die casting process is not applicable, which restricts its application in certain fields.

Porosity and Shrinkage Problems: During the die casting process, the cooling shrinkage of the molten metal and the inability of the gas to be completely discharged may lead to porosity or shrinkage defects inside the part, thus affecting the strength and appearance of the part.

Subsequent Machining Requirements: Although the die casting process is highly accurate, certain complex geometries or surface finishes may still require additional subsequent machining, which can add extra cost and man-hours.

Common Die Casting Questions and Answers

What is the die casting process?

Die casting is a casting process in which molten metal (e.g. aluminum, zinc, magnesium alloys) is injected into a precision mold under high pressure. The process is capable of producing parts with complex shapes and precise dimensions, and is widely used in the automotive, electronics, and home appliance industries. Through high-pressure injection, the molten metal fills the mold, and after cooling, the part is formed with good surface quality and high strength.

How productive is die casting?

The die casting process is highly productive and suitable for mass production. Once the mold is made, a large number of parts can be produced efficiently. Due to the high pressure injection of molten metal to fill the mold, the parts can be formed in a short period of time, shortening the production cycle, especially suitable for industries with high demand, such as the automotive and electronics industries.

What defects can occur in the die casting process?

The following defects may occur during the die casting process:

stoma: A cavity formed when gas fails to escape or cools unevenly.
cold storage: A crack or weak area formed by the failure of the metal to flow and join completely.
crackles: Cracks caused by improper mold design, uneven cooling or excessive metal stress.
surface defect: such as scratches, bubbles, etc., which may affect the cosmetic quality of the part.

Can die castings be post-processed?

Yes, die castings usually require some post-processing to further improve dimensional accuracy and surface quality. Common post-processing techniques include:

machining: Such as milling, turning, etc., for resizing parts and removing burrs or irregular surfaces.
surface treatment: Such as sandblasting, polishing, anodizing, etc., used to improve the appearance quality and corrosion resistance of parts.
hot treatment (e.g. of metal): To improve the hardness and strength of a part by annealing, quenching, etc., to meet specific work requirements.

What are the tolerances for die casting?

Tolerances for die casting processes are usually between ±0.1mm and ±0.5mm, with the exact tolerance range depending on the size and shape of the part. Through precise mold design and strict process control, die castings can achieve high dimensional accuracy and are suitable for industrial applications that require high tolerance requirements.

What is the usual lead time for die casting molds?

The lead time for die casting molds is usually 4 to 8 weeks, depending on the complexity of the mold, the choice of material, and the production capacity of the manufacturer. If the mold design is complex or requires multiple adjustments, the lead time may be extended.

What do I need to pay attention to in die casting design?

The following points need to be considered for die casting design:

Wall thickness uniformity: The wall thickness of the part should be uniform to avoid cold segregation or distortion.
Rational exhaust design: Design venting holes to expel air and gas to avoid porosity defects.
Cooling system design: There should be suitable cooling channels inside the mold to ensure uniform cooling of the molten metal and to reduce internal stress and deformation.
Runner and gate design: Reasonable design of runner and gate system to ensure the smooth flow of metal into the mold to avoid defects.

Why does porosity occur in die casting and how can it be avoided?

Porosity is formed when gas or air is not completely expelled from the molten metal. Common causes include poor exhaust design, excessive metal injection rate, and uneven cooling. Measures to avoid porosity are:

Improved exhaust design: Ensure that the mold is designed with adequate air vents.
Control of injection rate: Avoid excessive injection pressures and velocities that result in trapped gas.
Optimization of casting temperature: Ensure that the molten metal is at the right temperature and avoid overcooling or overheating.